coinst-upgrades: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/coinst-upgrades - from package: coinst

You may install the required package with command apt-get install {package}

Error in other languages:
coinst-upgrades: bevel nie gevind nie
coinst-upgrades: comandă negăsită
coinst-upgrades: comando não encontrado
coinst-upgrades: commande introuvable
coinst-upgrades: command not found
coinst-upgrades: käsku ei ole
coinst-upgrades: không tìm thấy lệnh
coinst-upgrades: komanda nerasta
coinst-upgrades: Kommando nicht gefunden.
coinst-upgrades: kommandot finns inte
coinst-upgrades: komut yok
coinst-upgrades: nie znaleziono polecenia
coinst-upgrades: níor aimsíodh an t-ordú
coinst-upgrades: no se encontró la orden
coinst-upgrades: no s'ha trobat l'ordre
coinst-upgrades: opdracht niet gevonden
coinst-upgrades: parancs nem található
coinst-upgrades: perintah tidak ditemukan
coinst-upgrades: príkaz nenájdený
coinst-upgrades: příkaz nenalezen
coinst-upgrades: команда не найдена
coinst-upgrades: командата не е открита
coinst-upgrades: 命令找不到
coinst-upgrades: コマンドが見つかりません